US5411388A - Rotary screw machine with thrust balanced bearings - Google Patents

Rotary screw machine with thrust balanced bearings Download PDF

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Publication number
US5411388A
US5411388A US08/211,677 US21167794A US5411388A US 5411388 A US5411388 A US 5411388A US 21167794 A US21167794 A US 21167794A US 5411388 A US5411388 A US 5411388A
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US
United States
Prior art keywords
thrust bearing
bearing means
balancing
rotary screw
screw machine
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US08/211,677
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English (en)
Inventor
Frits Soderlund
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Svenska Rotor Maskiner AB
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Svenska Rotor Maskiner AB
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Application filed by Svenska Rotor Maskiner AB filed Critical Svenska Rotor Maskiner AB
Assigned to SVENSKA ROTOR MASKINER AB reassignment SVENSKA ROTOR MASKINER AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SODERLUND, FRITS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/02—Arrangements of bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C39/00—Relieving load on bearings
    • F16C39/04—Relieving load on bearings using hydraulic or pneumatic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/43—Screw compressors

Definitions

  • the present invention relates to a rotary screw machine for a gaseous working medium with at least one screw rotor operating in a casing including a low and a high pressure end section, which rotor at operation is exposed to axial gas forces in a direction from the high pressure end section towards the low pressure end section, defined as the positive axial direction.
  • the rotor has at least one shaft journal mounted in beatings in one of said end sections, which beatings include thrust bearing means with main thrust bearing means adjacent the rotor and balancing thrust bearing means adjacent the outer end of the shaft journal, which thrust bearing means are provided with thrust balancing means located axially between the main and balancing thrust bearing means and exerting a positively directed axial force on the main thrust bearing means and a negatively directed axial force on the balancing thrust beating means.
  • thrust bearing in this application is used to mean bearings which transfer at least axial loads, i.e. pure axial beatings as well as bearings transferring both axial and radial loads.
  • the main thrust beating means transfer axial forces in the positive direction only whereas the balancing thrust beating means transfer axial forces in both directions.
  • a preloading spring acts on the balancing thrust bearing means, securing a proper axial localisation of the rotor so that a certain play between the high pressure end of the rotor and the adjacent end wall is assured when the machine is at rest or idles.
  • the positively directed axial gas Forces on the rotor are partly balanced by a piston of the thrust balancing means acting on the outer ring of the balancing thrust bearing means in the negative axial direction.
  • the balancing force is mainly received in that gas from the high pressure side of the machine is conducted to the piston to act thereon.
  • the balancing force will be larger than the force from the preloading spring with the effect that the resulting force on the outer ring of the balancing thrust bearing means is negatively directed, which force is transmitted to the rotor and counteracts the axial gas forces.
  • the main thrust bearing means therefore need to transfer only the remaining part of the axial gas forces.
  • This known device functions satisfactory for applications where the discharge pressure (when the machine is a compressor) is above a certain level, in which case it is possible to dimension the piston large enough to attain a force which is larger than the preload force.
  • the available space for the piston is limited, which in cases when the discharge pressure is not so high will raise problems to attain a balancing force exceeding the preloading force, which has to be above a certain level. In such cases, e.g. when the machine is a refrigeration compressor using refrigerant of the type R134a, the known device therefore cannot function satisfactory.
  • the object of the present invention is to improve the known thrust balancing device so that it is capable of functioning also at lower pressure levels at its high pressure side.
  • the solution according to the invention also has the advantage that the balancing thrust bearing means also can be of a cheaper kind. Since these bearings are exchanged at shorter intervals than the main thrust bearing means the total bearing costs will be reduced.
  • FIG. 1 is a schematic side view of a rotary screw compressor.
  • FIG. 2 is a section through a shaft journal of a rotor in a rotary screw compressor according to the invention.
  • the rotary screw compressor illustrated in FIG. 1 has a pair of intermeshing screw rotors 6 operating in a casing I having a low pressure end section 2 and a high pressure end section 3.
  • the working medium e.g. refrigerant R134a enters the compressor through an inlet channel 4 and after being compressed leaves the compressor through an outlet channel 5.
  • Each rotor is mounted in bearings in both end sections 2, 3.
  • the pressure difference between the low and high pressure ends of the compressor during operation results in that the gas exerts an axial force on each rotor from the high pressure end towards the low pressure end. This is defined as the positive axial direction.
  • FIG. 2 is a section through the shaft journal 7 of one of the rotors in the high pressure end section 3, and the arrow F A represents the positively directed axial force on the rotor.
  • the shaft journal 7 is mounted in a plurality of bearings, namely a radial roller bearing 8 and thrust ball bearings 9, 10 and 11 as seen in order from the rotor to the end of the shaft journal 7.
  • the two inner thrust ball bearings 9, 10 constitute the main thrust bearings and each of them is of the kind capable of transferring axial forces in only one direction.
  • One is mounted to transfer forces in the positive direction and the other one in the negative direction so that they taken together are capable of transferring forces in both directions.
  • the thrust ball bearing 11 at the outer end of the shaft journal is a thrust balancing bearing and is separated from the main thrust bearings 9, 10 by a distance sleeve 21.
  • the thrust balance bearing is capable of transferring axial forces acting on the shaft journal 7 in the positive direction only. All the bearings 8, 9, 10, 11 are kept in place by a key disc 25 at the end of the shaft journal 7.
  • a thrust balancing device 13 which consists of two annular members 18, 19 defining a sealed annular chamber 23 between them.
  • the annular chamber 23 communicates with a pressure medium channel 22 establishing fluid communication with the working fluid at the discharge side of the compressor.
  • the annular chamber accommodates a thrust spring 15 which holds the annular members 18 and 19 apart and preloads the thrust balancing bearing 11.
  • a cup spring 12 clamps the outer rings of the main thrust ball bearings 9, 10, the clamping force being transmitted by a sleeve 20 and the annular member 18 of the thrust balancing device 13.
  • the sleeve 20 and the annular member can be made as a single unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Supercharger (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
US08/211,677 1991-11-13 1992-11-05 Rotary screw machine with thrust balanced bearings Expired - Lifetime US5411388A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9103337 1991-11-13
SE9103337A SE469396B (sv) 1991-11-13 1991-11-13 Skruvrotormaskin med axialbalanserade lager
PCT/SE1992/000767 WO1993010333A1 (en) 1991-11-13 1992-11-05 Rotary screw machine with thrust balanced bearings

Publications (1)

Publication Number Publication Date
US5411388A true US5411388A (en) 1995-05-02

Family

ID=20384305

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/211,677 Expired - Lifetime US5411388A (en) 1991-11-13 1992-11-05 Rotary screw machine with thrust balanced bearings

Country Status (6)

Country Link
US (1) US5411388A (de)
EP (1) EP0612371B1 (de)
JP (1) JP3429306B2 (de)
DE (1) DE69208476T2 (de)
SE (1) SE469396B (de)
WO (1) WO1993010333A1 (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5719454A (en) * 1996-05-06 1998-02-17 Carrier Corporation Spring life improvement
US6042273A (en) * 1998-10-28 2000-03-28 Colonial Tool Group Inc. Adjustable preload spindle
US6048101A (en) * 1998-12-09 2000-04-11 Sullair Corporation Thrust bearing arrangement
US6059551A (en) * 1996-10-25 2000-05-09 Kabushiki Kaisha Kobe Seiko Sho Oil injected screw compressor with thrust force reducing means
US6506031B2 (en) * 2001-04-04 2003-01-14 Carrier Corporation Screw compressor with axial thrust balancing and motor cooling device
US20070196228A1 (en) * 2003-11-10 2007-08-23 Tunna Clive Marcus L Dry Pumps
US20070211976A1 (en) * 2004-05-07 2007-09-13 Fox Gerald P Locating Bearing Assembly for Wind Turbine Gearbox Shaft
US20080085207A1 (en) * 2006-10-10 2008-04-10 Dieter Mosemann Oil-flooded screw compressor with axial-thrust balancing device
US20080285906A1 (en) * 2005-11-17 2008-11-20 Schaeffler Kg Bearing Set with an Angular Ball Bearing and Cylinder Roller Bearing Receiving Axial Forces
DE102010043807A1 (de) * 2010-11-12 2012-05-16 Aktiebolaget Skf Wälzlagerträgermodul und Kompressor
RU2464427C1 (ru) * 2011-06-03 2012-10-20 Закрытое Акционерное Общество "Эко-Энергетика" Паровая винтовая машина
US20130004107A1 (en) * 2011-02-25 2013-01-03 Nsk Ltd. Multiple row combination ball bearing
US9816553B2 (en) 2013-10-25 2017-11-14 Kobe Steel, Ltd. Compressor having balance mechanism for a thrust bearing
RU2643891C1 (ru) * 2017-06-07 2018-02-06 Акционерное общество "Научно-исследовательский и конструкторский институт центробежных и роторных компрессоров им. В.Б. Шнеппа" Винтовой компрессор
US10288070B2 (en) 2014-12-17 2019-05-14 Carrier Corporation Screw compressor with oil shutoff and method
RU2702812C1 (ru) * 2019-05-30 2019-10-11 Акционерное общество "Научно-исследовательский и конструкторский институт центробежных и роторных компрессоров им. В.Б. Шнеппа" Подшипниковый узел ротора винтового компрессора
CN113423933A (zh) * 2019-02-05 2021-09-21 比泽尔制冷设备有限公司 用于减压或压缩气态的介质的机器
US11473623B2 (en) * 2019-11-25 2022-10-18 Aktiebolaget Skf Bearing assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008054013A1 (de) * 2008-10-30 2010-05-06 Schaeffler Kg Lageranordnung einer vertikal stehenden Antriebsspindel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227755A (en) * 1977-10-24 1980-10-14 Stal Refrigeration Ab Bearing arrangement for shaft of rotary compressor
US4462769A (en) * 1981-12-02 1984-07-31 Sullair Technology Ab Method at an oil-injected screw-compressor
US4730995A (en) * 1986-09-25 1988-03-15 American Standard Inc. Screw compressor bearing arrangement with positive stop to accommodate thrust reversal
US4915514A (en) * 1987-02-18 1990-04-10 Svenska Rotor Maskiner Ab Rotary machine equipped with a thrust balancing arrangement
WO1991017345A1 (en) * 1990-05-08 1991-11-14 Svenska Rotor Maskiner Ab Rotary screw compressor with thrust balancing means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227755A (en) * 1977-10-24 1980-10-14 Stal Refrigeration Ab Bearing arrangement for shaft of rotary compressor
US4462769A (en) * 1981-12-02 1984-07-31 Sullair Technology Ab Method at an oil-injected screw-compressor
US4730995A (en) * 1986-09-25 1988-03-15 American Standard Inc. Screw compressor bearing arrangement with positive stop to accommodate thrust reversal
US4915514A (en) * 1987-02-18 1990-04-10 Svenska Rotor Maskiner Ab Rotary machine equipped with a thrust balancing arrangement
WO1991017345A1 (en) * 1990-05-08 1991-11-14 Svenska Rotor Maskiner Ab Rotary screw compressor with thrust balancing means

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5719454A (en) * 1996-05-06 1998-02-17 Carrier Corporation Spring life improvement
US6059551A (en) * 1996-10-25 2000-05-09 Kabushiki Kaisha Kobe Seiko Sho Oil injected screw compressor with thrust force reducing means
US6042273A (en) * 1998-10-28 2000-03-28 Colonial Tool Group Inc. Adjustable preload spindle
US6048101A (en) * 1998-12-09 2000-04-11 Sullair Corporation Thrust bearing arrangement
WO2000034674A1 (en) 1998-12-09 2000-06-15 Sullair Corporation Thrust bearing arrangement
US6506031B2 (en) * 2001-04-04 2003-01-14 Carrier Corporation Screw compressor with axial thrust balancing and motor cooling device
US20070196228A1 (en) * 2003-11-10 2007-08-23 Tunna Clive Marcus L Dry Pumps
US20070211976A1 (en) * 2004-05-07 2007-09-13 Fox Gerald P Locating Bearing Assembly for Wind Turbine Gearbox Shaft
US7572061B2 (en) * 2004-05-07 2009-08-11 The Timken Company Locating bearing assembly for wind turbine gearbox shaft
US20080285906A1 (en) * 2005-11-17 2008-11-20 Schaeffler Kg Bearing Set with an Angular Ball Bearing and Cylinder Roller Bearing Receiving Axial Forces
US20080085207A1 (en) * 2006-10-10 2008-04-10 Dieter Mosemann Oil-flooded screw compressor with axial-thrust balancing device
DE102010043807A1 (de) * 2010-11-12 2012-05-16 Aktiebolaget Skf Wälzlagerträgermodul und Kompressor
US20140314358A1 (en) * 2010-11-12 2014-10-23 Michel Seubert Rolling-element bearing support module and compressor
US9360046B2 (en) * 2011-02-25 2016-06-07 Nsk Ltd. Multiple row combination ball bearing
US20130004107A1 (en) * 2011-02-25 2013-01-03 Nsk Ltd. Multiple row combination ball bearing
RU2464427C1 (ru) * 2011-06-03 2012-10-20 Закрытое Акционерное Общество "Эко-Энергетика" Паровая винтовая машина
WO2012166020A1 (ru) * 2011-06-03 2012-12-06 Закрытое Акционерное Общество "Эко-Энергетика" Паровая винтовая машина
US9816553B2 (en) 2013-10-25 2017-11-14 Kobe Steel, Ltd. Compressor having balance mechanism for a thrust bearing
US10288070B2 (en) 2014-12-17 2019-05-14 Carrier Corporation Screw compressor with oil shutoff and method
RU2643891C1 (ru) * 2017-06-07 2018-02-06 Акционерное общество "Научно-исследовательский и конструкторский институт центробежных и роторных компрессоров им. В.Б. Шнеппа" Винтовой компрессор
CN113423933A (zh) * 2019-02-05 2021-09-21 比泽尔制冷设备有限公司 用于减压或压缩气态的介质的机器
US20210363989A1 (en) * 2019-02-05 2021-11-25 Bitzer Kuehlmaschinenbau Gmbh Machine for depressurizing or compressing gaseous media
US11939978B2 (en) * 2019-02-05 2024-03-26 Bitzer Kuehlmaschinenbau Gmbh Machine for depressurizing or compressing gaseous media
RU2702812C1 (ru) * 2019-05-30 2019-10-11 Акционерное общество "Научно-исследовательский и конструкторский институт центробежных и роторных компрессоров им. В.Б. Шнеппа" Подшипниковый узел ротора винтового компрессора
US11473623B2 (en) * 2019-11-25 2022-10-18 Aktiebolaget Skf Bearing assembly

Also Published As

Publication number Publication date
SE469396B (sv) 1993-06-28
SE9103337D0 (sv) 1991-11-13
DE69208476D1 (de) 1996-03-28
JPH07501123A (ja) 1995-02-02
EP0612371B1 (de) 1996-02-21
DE69208476T2 (de) 1996-09-05
EP0612371A1 (de) 1994-08-31
JP3429306B2 (ja) 2003-07-22
SE9103337L (sv) 1993-05-14
WO1993010333A1 (en) 1993-05-27

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